Are the samples from the same geographical area? (climate classification)
What is the distance between the stations?
What is your null assumption (H0)?
If it is from a different geographical area, there probably should be some change, so with a large enough sample size, you will be able to prove this change ...
In this case, you should be more interested in effect size and on the confidence interval.
Generally, if the null assumption is that the amount of rainfall is equal (the same geographical area) you can use the one way ANOVA and/or Tukey HSD.